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qrcp
:zap: Transfer files over wifi from your computer to your mobile device by scanning a QR code without leaving the terminal.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you want to do it from your phone, there are online websites which can do this for a subscription, (there are shortcuts for Siri also, etc) and if you are working from your computer, you can just use qrcp, which is absolutely free and MIT License. Nothing beats open source. Get it from GitHub in a matter of seconds, use this pattern to create a QR code which multiple students can scan, and project it to your whiteboard. Everyone will have the files readily.